Note 20 - Stock Options - Summary of Options Activities (Details) - USD ($)		9 Months Ended		12 Months Ended
	Jun. 30, 2022	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2023
Employee Stock Option Plan 2017 [Member]
Outstanding, options (in shares)	236,375	216,375
Outstanding, weighted average exercise price (in dollars per share)	$ 5.21	$ 4.89
Outstanding, weighted average remaining contractual term (Year)	2 years 7 months 9 days	3 years 8 months 4 days	3 years 2 months 1 day	2 years 11 months 1 day
Aggregate intrinsic value outstanding	$ 87	$ 331	$ 117	$ 140
Granted, options (in shares)		122,500	65,000
Granted, weighted average exercise price (in dollars per share)		$ 4.96	$ 4.84
Exercised, options (in shares)		64,625	5,000
Exercised, options (in shares)		(64,625)	(5,000)
Exercised, weighted average exercise price (in dollars per share)		$ 3.14	$ 3.75
Forfeited or expired (in shares)		3,500	80,000
Forfeited or expired, options (in shares)		(3,500)	(80,000)
Forfeited or expired, weighted average exercise price (in dollars per share)		$ 3.75
Outstanding, options (in shares)		270,750	216,375	216,375
Outstanding, options (in shares)		270,750	216,375	216,375
Outstanding, weighted average exercise price (in dollars per share)		$ 5.35	$ 4.89	$ 4.89
Outstanding, weighted average exercise price (in dollars per share)		$ 5.35	$ 4.89	$ 4.89
Exercisable, options (in shares)		136,250	134,625
Exercisable, weighted average exercise price (in dollars per share)		$ 5.57	$ 4.49
Exercisable, weighted average remaining contractual term (Year)		3 years 1 month 13 days	2 years 6 months 7 days
Exercisable, aggregate intrinsic value		$ 150	$ 109
Director Plan 2017 [Member]
Outstanding, options (in shares)		420,000	420,000	420,000
Outstanding, weighted average exercise price (in dollars per share)		$ 4.91	$ 5.1	$ 5.1
Outstanding, weighted average remaining contractual term (Year)	2 years 10 months 6 days	2 years 10 months 13 days	2 years 8 months 4 days	2 years 10 months 28 days
Aggregate intrinsic value outstanding	$ 228	$ 744	$ 303	$ 309
Granted, options (in shares)		100,000	100,000
Granted, weighted average exercise price (in dollars per share)		$ 5.01	$ 4.51
Exercised, options (in shares)		49,000	0
Exercised, options (in shares)		(49,000)	0
Exercised, weighted average exercise price (in dollars per share)		$ 3.51
Forfeited or expired (in shares)		(0)	80,000
Forfeited or expired, options (in shares)		0	(80,000)
Forfeited or expired, weighted average exercise price (in dollars per share)		$ 0	$ 5.98
Outstanding, options (in shares)	420,000	471,000	440,000	420,000
Outstanding, options (in shares)	420,000	471,000	440,000	420,000
Outstanding, weighted average exercise price (in dollars per share)	$ 5.1	$ 5.08	$ 4.8	$ 4.91
Outstanding, weighted average exercise price (in dollars per share)	$ 5.1	$ 5.08	$ 4.8	$ 4.91
Exercisable, options (in shares)		471,000	440,000
Exercisable, weighted average exercise price (in dollars per share)		$ 5.08	$ 4.8
Exercisable, weighted average remaining contractual term (Year)		2 years 10 months 13 days	2 years 8 months 4 days
Exercisable, aggregate intrinsic value		$ 744	$ 303